Personalize field to Shopify button email link

[Boyonly]

Hi Community!,

I'm trying to customize the link sent out from the Shopify email using Liquid. 

The expected output of the link when the recipient clicks on the button is 

https://www.aaa.com?name={{ data.customer.first_name }}{{ data.customer.last_name }}&email={{ data.customer.email }}&a2=1

However, the actual link from the email didn't replace the variables {{ data.customer.first_name }}{{ data.customer.last_name }} and {{ data.customer.email }}. Instead, it removes those variables and add &syclid back to the link value. 

https://www.aaa.com?a2=1&syclid=ckrql8fvoevs7395knbg

How can I use the Custom liquid to generate personalized link to the email recipient? 

Thank you for your help!